DE102016222878A1 - Method for teaching a point of contact of a clutch - Google Patents

Abstract

A method and apparatus for teaching a touch point of a clutch is provided. The method for teaching the touch point of the clutch includes a step of outputting a first control signal for controlling to transition to a touch point learning mode when a predetermined condition is satisfied, a step of calculating a reference value by dividing a difference value between a drive speed of a drive shaft clutch and a drive speed of a non-drive shaft clutch through a difference value between a drive speed of an engine and the drive speed of the drive shaft clutch, a step of outputting a second control signal for shifting the non-drive shaft clutch toward the engine when the reference value is smaller than a predetermined threshold value, and a step of detecting a position of the non-drive shaft clutch at a time when the reference value reaches the predetermined threshold as the touch point t.

Description

This application claims the priority of Korean Patent Application No. 10-2015-0162968 , filed in the Korean Patent Office on November 20, 2015, the contents of which are hereby incorporated by reference in their entirety.

BACKGROUND

1st area

The present inventive concept relates to a method of teaching a touch point of a clutch and, more particularly, to a method of teaching a touch point of a clutch, transitioning to a touch point learning mode based on an assessment of the state of clutches and a touch point based on Drive speeds of a drive shaft clutch, a non-drive shaft clutch and a motor is determined.

2. Description of the Related Art

A dual-clutch transmission (DCT) is an automatic transmission with two clutches. It is a clutch system that selectively transmits torque received from one engine to two input shafts using two clutches. Since gears are arranged on the two input shafts, power is transmitted to the wheels according to a gear ratio.

At this time, each of the clutches transmits the torque of the engine to the wheels by switching, step by step, from an open clutch state in which the clutch is mechanically separated from the engine, to a slip state in which friction is applied to the clutch and that a difference in speed between both ends of the clutch becomes equal to or greater than a predetermined value, and then a locked state is adopted in which there is no difference in speed between both ends of the clutch, and the torque of the engine, which is transmitted to the input shaft of the clutch is transmitted to an output shaft which is connected to the wheels. If the clutch is disconnected from the engine, the previous procedure is performed in reverse order.

A touch point is a position at which a clutch slips, i.e., slips, d. H. a position where power from a motor starts at the clutch. The touch point may vary depending on a temperature change or wear. For stable operation of the coupling, it is therefore important to train the position of the contact point in advance.

Therefore, there is a need for a new type of touch point teaching method that makes it possible to reduce a clutch control error by accurately teaching a touch point.

OVERVIEW

Aspects of the inventive concept provide a method of teaching a touch point of a clutch, which method is used to significantly reduce a control error.

Aspects of the inventive concept further provide a method of teaching a touch point, wherein the method is used to train a touch point even while driving a vehicle.

However, aspects of the inventive concept are not limited to the one aspect presented herein. The foregoing and other aspects of the inventive concept will become more apparent to one of ordinary skill in the art related to the inventive concept by reference to the following detailed description of the inventive concept.

According to one aspect of the inventive concept, there is provided a method of teaching a touch point of a clutch, the method comprising: outputting a first control signal for controlling to transition to a touch point learning mode when a predetermined condition is met, calculating a reference value by dividing a reference value between the drive speed of a drive shaft clutch and a drive speed of a non-drive shaft clutch by a difference value between a drive speed of an engine and the drive speed of the drive shaft clutch, outputting a second control signal for shifting the non-drive shaft clutch toward the motor when the reference value is less than a predetermined threshold, and determining a position of the non-drive shaft clutch at a time when the reference value is the predetermined threshold value t reaches, as the point of contact.

According to another aspect of the inventive concept, there is provided a tapping point teaching apparatus, the apparatus comprising: a judging unit that outputs a first control signal for controlling to transition to a touch point learning mode when a predetermined condition is met, a reference value calculating unit calculating a reference value by dividing a difference value between a drive speed of a drive shaft clutch and a drive speed of a non-drive shaft clutch by a difference value between a drive speed of an engine and the drive speed of the drive shaft clutch, a clutch control unit including a second control signal for shifting the non-Anitriebswellenkupplung towards the engine when the reference value is smaller than a predetermined threshold, and a touch point determination unit that outputs a position of the non-drive shaft clutch at a time point at which the reference value reaches the predetermined threshold, determined as the touch point.

BRIEF DESCRIPTION OF THE DRAWINGS

These and / or other aspects will be apparent from the following description of the embodiments and may be readily understood when considered in conjunction with the accompanying drawings in which:

1 FIG. 4 is a functional block diagram of a touchpoint learning device according to an embodiment; FIG.

2 FIG. 10 is a flowchart illustrating a method of teaching a touch point of a clutch according to an embodiment; FIG.

3 shows the driving speeds of a motor, a drive shaft coupling and a non-drive shaft coupling according to an embodiment; and

4 shows the change in the drive speeds of a motor, a drive shaft clutch, and a non-drive shaft clutch in a case in which transition to a touch point learning mode according to an embodiment.

DETAILED DESCRIPTION

The present inventive concept will now be described in more detail with reference to the accompanying drawings, in which illustrative embodiments of the inventive concept are shown. Advantages and characteristics of the inventive concept and methods for implementing these concepts may be better understood by reference to the following detailed description of illustrative embodiments and to the accompanying drawings. However, the inventive concept can be implemented in many different forms and should not be construed as limited to the embodiments presented herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art, and the inventive concept is defined only by the appended claims. Throughout the description, like reference numerals are used to designate like elements.

Unless otherwise specified, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood to one of ordinary skill in the art to which the inventive concept belongs. It should also be noted that terms, such as those defined in commonly used dictionaries, should be construed as having a meaning consistent with their meaning in the context of the relevant art, and they are not in an idealized or overly formal way, unless explicitly defined otherwise herein.

As used herein, the forms of the singular "one, one, one," and "the, that," are meant to include plural forms, unless the context clearly indicates otherwise. Further, it should be understood that the terms "comprising" and / or "comprising" when used in this application indicate the presence of specified components, steps, operations and / or elements, but the presence or addition of a or several other components, steps, operations, elements and / or groups thereof.

1 is a functional block diagram of a device 100 for teaching a touch point according to an embodiment.

According to 1 has the device 100 for teaching a touch point, a grading unit 110 , a reference value calculation unit 120 , a clutch control unit 130 and a touch point determination unit 140 on. In 1 only elements that relate to the current embodiment are shown. Therefore, the expert recognizes in the field to which the inventive concept relates, that other elements for general purposes in addition to those in 1 may be present.

Further, in the current embodiment, the evaluation unit 110 , the reference value calculation unit 120 , the clutch control unit 130 and the touch point determination unit 140 shown as separate elements. However, their functions may also be performed by a single element, such as an electronic control unit (ECU).

The valuation unit 110 outputs a first control signal, after which a touch point teaching mode is to be started when a predetermined condition is met. The predetermined condition may be that a drive shaft clutch is in a slip state and a non-drive shaft clutch is in an open state.

A dual-clutch transmission (DCT) transmits power generated by an engine to wheels using two clutches. When a clutch receives power from the engine, the other clutch remains in an open clutch state where it is mechanically isolated from the engine.

Here, the clutch, which is connected to the engine for receiving power from the engine, a drive shaft clutch, and the clutch, which remains in the open clutch state, in which it is mechanically separated from the engine, is a non-drive shaft clutch.

When the drive shaft clutch is in the slip state in which it starts to be in a state of friction with the engine, and when the non-drive shaft clutch is in the open state, the evaluation unit evaluates 110 according to the embodiment, that the predetermined condition is satisfied. Therefore, the valuation unit gives 110 a first control signal to control that transition to the touch point teach-in mode.

The reference value calculation unit 120 calculates a reference value by dividing a difference value between the drive speed of the input shaft clutch and the drive speed of the non-drive shaft clutch by a difference value between the drive speed of the motor and the drive speed of the input shaft clutch.

Once the touch point teaching mode is started, it means that the predetermined condition is satisfied and that the drive shaft coupling maintains the grinding condition in accordance with the predetermined condition. Therefore, the drive shaft coupling is rotated at a certain speed by a proportion of power that is taken from the motor, in rotation.

Further, although the non-drive shaft coupling does not receive power from the engine, it can be rotated at a certain speed by the action of inertia, for example. Therefore, the reference value calculation unit calculates 120 According to the embodiment, the reference value using the following equation. Reference value = | Drive speed of drive shaft coupling - Drive speed of non-drive shaft clutch | / | Drive speed of motor - Drive speed of drive shaft clutch | (1).

If the reference value is less than a predetermined threshold, the clutch control unit indicates 130 a second control signal to shift the non-drive shaft clutch toward the engine.

When the non-drive shaft clutch is shifted toward the engine by the second control signal, the power generated by the engine is gradually transmitted to the non-drive shaft clutch. Therefore, the drive speed of the non-drive shaft clutch increases, whereby the reference value increases.

For example, assume that the drive speed of the motor is 2000 rpm, that the drive shaft clutch which is in the grinding state rotates at a lower speed of 500 rpm, and that the non-drive shaft clutch rotates at 200 rpm due to inertia. In this case, according to the foregoing equation, the reference value is (500-200) / (2000-500) = 0.2.

If the non-drive shaft due to the clutch control unit 130 gradually moving toward the engine, it transitions from the open clutch state to the slip state. Therefore, the power generated by the engine is transmitted to the non-drive shaft clutch. When the drive speed of the non-drive shaft clutch gradually increases as the non-drive shaft approaches the engine, the reference value also increases.

The touch point determination unit 140 determines the position of the non-drive shaft clutch at a time when the reference value reaches the predetermined threshold as a touch point.

As described above, the reference value increases as the non-drive shaft clutch moves toward the engine. This is because the power generated by the engine is transferred to the non-drive shaft clutch as the non-drive shaft moves toward the engine.

Consequently, the touch point determination unit 140 According to the embodiment, the position of the non-drive shaft clutch at a time point when the reference value reaches the predetermined threshold value, as a point of contact at which the non-drive shaft clutch starts to go into a frictional state with the engine.

When the touch point of the clutch is detected in the foregoing manner, the touch point can be learned even when a vehicle is being driven. That is, since the touch point is detected by gradually shifting the non-drive shaft clutch which does not transmit power generated by the engine, the touch point can be determined even when the drive shaft clutch transmits power.

Further, since the touch point is detected when the input shaft clutch is in the slip state, a control error can be avoided.

2 FIG. 10 is a flowchart illustrating a method of teaching a touch point of a clutch according to an embodiment. FIG.

Only when a predetermined condition is met may, according to one embodiment, be transitioned to a touch point teach-in mode. Therefore, the valuation unit evaluates 110 whether a drive shaft clutch is in an abrasive state (step S210) and a non-drive shaft clutch in an open state (step S220), which corresponds to the predetermined condition.

Furthermore, the valuation unit 110 According to the embodiment, evaluate whether the drive speed of the drive shaft clutch is within a predetermined range (S230). If the drive speed of the input shaft clutch is too high or too low, an accurate touch point can not be determined, resulting in an error.

If the previous condition is satisfied, the reference value calculation unit calculates 120 a reference value by dividing a difference value between the drive speed of the input shaft clutch and the drive speed of the non-drive shaft clutch by a difference value between the drive speed of an engine and the drive speed of the input shaft clutch (step S240).

Then, when the reference value is smaller than a predetermined threshold (step S250), the clutch control unit increases 130 the position of the non-drive shaft coupling (step S260). Incidentally, increasing the position of the non-drive shaft clutch is to move the non-drive shaft clutch toward the engine.

As the position of the non-drive shaft increases, the drive speed of the non-drive shaft coupling increases. Consequently, the reference value is also increasing.

When the reference value reaches the predetermined threshold, the touch point determination unit determines 140 in that the non-drive shaft coupling has reached a point of contact at which the non-drive shaft coupling begins to receive power from the engine. Therefore, the touch point determination unit determines 140 the position of the non-drive shaft clutch at the time point when the reference value reaches the predetermined threshold value as the touch point (step S280).

Once the touch point is detected, the non-drive shaft clutch is decoupled to prevent a lock due to engagement of the non-drive shaft clutch (step S290).

The locking means a state in which the non-drive shaft coupling is fully coupled to the engine and thus receives power from the engine and the lock means a state in which both clutches are simultaneously coupled to the engine.

3 FIG. 10 shows the driving speeds of a motor, a drive shaft coupling and a non-drive shaft coupling according to one embodiment. FIG.

In 3 the drive speeds of the engine, the drive shaft coupling and the non-drive shaft coupling are shown over time. Furthermore, a grinding state is maintained by the drive shaft coupling, and of the Non-drive shaft clutch is maintained in an open state.

Since the drive shaft clutch is in the grinding state, it can not completely absorb power generated by the engine. Therefore, the drive speed 320 the drive shaft coupling is smaller than the drive speed 310 of the motor.

Since the non-drive shaft coupling is in the open state, it can not absorb power from the engine. However, the non-drive shaft clutch may have a certain speed due to, for example, inertia. Therefore, the drive speed 330 the non-drive shaft coupling be less than the drive speed 320 the drive shaft coupling.

There are d1 340 a difference between the drive speed 310 of the engine and the drive speed 320 the drive shaft coupling on, and d2 350 gives a difference between the drive speed 320 the drive shaft coupling and the drive speed 330 the non-drive shaft coupling on. The differences d1 340 and d2 350 used to calculate a reference value according to an embodiment.

When the drive speeds of the engine, the drive shaft clutch and the non-drive shaft clutch, which in 3 are satisfied to satisfy a predetermined condition according to an embodiment, transition is made to a touch point teaching mode.

Especially when the drive speed 320 the drive shaft clutch is within a predetermined range, a transition is made to the touch point teach-in mode.

4 FIG. 12 shows the change in drive speeds of a motor, a drive shaft clutch, and a non-drive shaft clutch in a case where a transition to a touch point teach-in mode according to an embodiment is made.

In 4 denotes t1 440 a time at which the clutch control unit 130 begins to move the non-drive shaft coupling towards the engine. As the non-drive shaft clutch approaches the engine, it absorbs power from the engine. Therefore, the drive speed increases 430 the non-drive shaft coupling gradually on.

With increasing drive speed 430 the non-drive shaft coupling increases a value d2 ' 470 gradually. In the foregoing equation (1), d2 ' 470 in the counter. Because d2 ' 470 increases while d1 ' 460 remains unchanged, the reference value increases.

When the reference value reaches a predetermined threshold, the touch point determination unit may 170 According to the embodiment, determine the position of the non-drive shaft clutch at this time as a touch point.

Therefore, the touch point can be detected even when a vehicle is in motion, and a control error can be reduced since a precise touch point can be detected.

According to a method of teaching a touch point according to an embodiment, a touch point may be learned even when a vehicle is in motion.

Further, since a touch point is detected when a drive shaft clutch is in a slipping state, a control error can be reduced.

Although the inventive concept is shown and described with particular reference to specific embodiments thereof, those skilled in the art will recognize that various changes in form and detail may be made without departing from the spirit and scope of the inventive concept as defined by the following claims to deviate. The illustrative embodiments should be understood only in a descriptive sense and not for the purpose of limitation. Therefore, the scope of the inventive concept is not limited by the detailed description of the inventive concept but by the following claims, and all differences within the scope are to be construed be included in the inventive concept.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 10-2015-0162968 [0001]

Claims (6)

A method of teaching a touch point, the method comprising: Outputting a first control signal for controlling to transition to a touch point teaching mode when a predetermined condition is met; Calculating a reference value by dividing a difference value between a drive speed of a drive shaft clutch and a drive speed of a non-drive shaft clutch by a difference value between a drive speed of an engine and the drive speed of the drive shaft clutch; Outputting a second control signal for shifting the non-drive shaft clutch toward the engine when the reference value is less than a predetermined threshold; and Determining a position of the non-drive shaft coupling as the touch point at a time when the reference value reaches the predetermined threshold. The method of claim 1, wherein outputting the first control signal for controlling to transition to the touch point teach-in mode when the predetermined condition is met comprises: transitioning to the touch point teach-in mode when the drive shaft clutch is in a slip state and the non-slip state Drive shaft coupling is in an open state. The method of claim 2, wherein transitioning to the touch point teach-in mode comprises: transitioning to the touch point teach-in mode when the drive speed of the drive shaft coupling is within a predetermined range. An apparatus for teaching a touch point, the apparatus comprising: a judging unit that outputs a first control signal for controlling to transition to a touch point teaching mode when a predetermined condition is met; a reference value calculating unit that calculates a reference value by dividing a difference value between a drive speed of a drive shaft clutch and a drive speed of a non-drive shaft clutch by a difference value between a drive speed of an engine and the drive speed of the drive shaft clutch; a clutch control unit outputting a second control signal so that the non-drive shaft clutch is shifted toward the engine when the reference value is smaller than a predetermined threshold value; and a touch point determination unit that detects a position of the non-drive shaft clutch as the touch point at a time point at which the reference value reaches the predetermined threshold value. The apparatus of claim 4, wherein the evaluation unit controls to transition to the touch point teach-in mode when the drive shaft clutch is in a slip state and the non-drive shaft clutch is in an open state. The apparatus of claim 5, wherein the evaluation unit controls to transition to the touch point teaching mode when the drive speed of the drive shaft coupling is within a predetermined range.

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